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Iterative approach to computational enzyme design

Privett, Heidi K. and Kiss, Gert and Lee, Toni M. and Blomberg, Rebecca and Chica, Roberto A. and Thomas, Leonard M. and Hilvert, Donald and Houk, Kendall N. and Mayo, Stephen L. (2012) Iterative approach to computational enzyme design. Proceedings of the National Academy of Sciences of the United States of America, 109 (10). pp. 3790-3795. ISSN 0027-8424. PMCID PMC3309769. http://resolver.caltech.edu/CaltechAUTHORS:20120326-153311623

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Abstract

A general approach for the computational design of enzymes to catalyze arbitrary reactions is a goal at the forefront of the field of protein design. Recently, computationally designed enzymes have been produced for three chemical reactions through the synthesis and screening of a large number of variants. Here, we present an iterative approach that has led to the development of the most catalytically efficient computationally designed enzyme for the Kemp elimination to date. Previously established computational techniques were used to generate an initial design, HG-1, which was catalytically inactive. Analysis of HG-1 with molecular dynamics simulations (MD) and X-ray crystallography indicated that the inactivity might be due to bound waters and high flexibility of residues within the active site. This analysis guided changes to our design procedure, moved the design deeper into the interior of the protein, and resulted in an active Kemp eliminase, HG-2. The cocrystal structure of this enzyme with a transition state analog (TSA) revealed that the TSA was bound in the active site, interacted with the intended catalytic base in a catalytically relevant manner, but was flipped relative to the design model. MD analysis of HG-2 led to an additional point mutation, HG-3, that produced a further threefold improvement in activity. This iterative approach to computational enzyme design, including detailed MD and structural analysis of both active and inactive designs, promises a more complete understanding of the underlying principles of enzymatic catalysis and furthers progress toward reliably producing active enzymes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1073/pnas.1118082108 DOIArticle
http://www.pnas.org/content/109/10/3790PublisherArticle
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3309769/PubMed CentralArticle
ORCID:
AuthorORCID
Houk, Kendall N.0000-0002-8387-5261
Additional Information:© 2011 National Academy of Sciences. Contributed by Stephen L. Mayo, November 4, 2011 (sent for review September 6, 2011). We thank Jens Kaiser and Pavle Nikolovski at the Caltech Molecular Observatory for assistance in crystal screening, crystallographic data collection, and structure determination. We are grateful to Daniela Röthlisberger and David Baker for providing genes for the KE positive controls and to Marie Ary and Scott A. Johnson for assistance with the manuscript. Data for the HG-2 and 1A53-2 structures were collected at beamline 12-2 at the Stanford Synchrotron Radiation Lightsource (SSRL, SLAC National Accelerator Laboratory, Menlo Park, CA).We acknowledge the Gordon and Betty Moore Foundation for support of the Molecular Observatory at Caltech and the Department of Energy and National Institutes of Health for supporting the SSRL. This work was supported by the Defense Advanced Research Projects Agency, a Department of Defense National Security Science and Engineering Faculty Fellowship (S.L.M.), and a Lawrence Livermore National Laboratory Lawrence Scholars Fellowship (G.K.). Fellowship support from the Fonds des Verbandes der chemischen Industrie and the Studienstiftung des deutschen Volkes (R.B.) is gratefully acknowledged. Author contributions: H.K.P., G.K., T.M.L., D.H., K.N.H., and S.L.M. designed research; H.K.P., G.K., T.M.L., R.B., R.A.C., and L.M.T. performed research; H.K.P., G.K., T.M.L., R.B., R.A.C., L.M.T., D.H., K.N.H., and S.L.M. analyzed data; and H.K.P., G.K., T.M.L., R.B., R.A.C., L.M.T., D.H., K.N.H., and S.L.M. wrote the paper. Data deposition: The atomic coordinates and structure factors have been deposited in the Protein Data Bank, www.pdb.org (PDB ID codes 3O2L, 3NYD, 3NYZ, and 3NZ1).
Funders:
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
National Security Science and Engineering Faculty FellowshipUNSPECIFIED
Lawrence Livermore National LaboratoryUNSPECIFIED
Fonds des Verbandes der chemischen Industrie UNSPECIFIED
Studienstiftung des deutschen VolkesUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NIHUNSPECIFIED
Subject Keywords:computational protein design; de novo enzyme design; proton transfer
PubMed Central ID:PMC3309769
Record Number:CaltechAUTHORS:20120326-153311623
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120326-153311623
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29849
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Apr 2012 22:02
Last Modified:14 Apr 2017 00:07

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